Via Microstation Pen Table-> Text Sub (_FILEL_) for the Directory path and filename to appear on the plots.
The Directory path should use \ to separate the drive and directories out to the filename.
Issue is text sub uses the ? instead of the proper \.
Change the font to one that recognizes the \. Fonts will use the ? if it doesn't know the symbol, any Bentley delivered font should use the \ to separate the path and filename.